Flow cytometry as a diagnostic tool in neuroblastoma.

Area of Science:

• Pediatric Oncology
• Immunophenotyping
• Diagnostic Pathology

Background:

• Childhood solid neoplasms are increasingly diagnosed and monitored using flow cytometry (FC) immunophenotyping.
• Neuroblastoma (NB) is the most prevalent extracranial solid tumor in pediatric patients.
• Current diagnostic standards for NB involve anatomopathological examination (PA) and immunohistochemistry (IHC).

Purpose of the Study:

• To compare the diagnostic accuracy of FC immunophenotyping against PA/IHC for neuroblastoma.
• To evaluate FC's utility in diagnosing and monitoring NB in pediatric patients.
• To assess FC's performance metrics including sensitivity, specificity, and predictive values.

Main Methods:

• Retrospective analysis of 48 samples (bone marrow, peripheral blood, primary tumors, liver nodules, rib fragments) from 21 pediatric patients with suspected or confirmed NB.
• Comparison of results obtained via FC immunophenotyping and traditional PA/IHC.
• PA/IHC was considered the gold standard for evaluating FC performance.

Main Results:

• FC identified NB in 13 samples (7 bone marrow, 5 primary tumors, 1 liver nodule), while PA/IHC detected NB in 8 samples (3 bone marrow, 5 primary tumors).
• Overall concordance between FC and PA/IHC was 88.9%.
• FC demonstrated 100% sensitivity and 86% specificity for NB detection when compared to PA, with a 100% negative predictive value.

Conclusions:

• Flow cytometry immunophenotyping is a viable and accurate method for the diagnosis and assessment of neuroblastoma involvement in pediatric patients.
• FC offers advantages of rapid diagnosis and precise disease classification.
• FC can serve as a valuable tool for monitoring treatment response in neuroblastoma.